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Responding to tab changes in a tab navigator

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"     backgroundColor="white">     <mx:Script>                  import mx.controls.Alert;         private function handleChange():void         {             Alert.show(myTabNav.selectedIndex + " Label: " + myTabNav.selectedChild.label);         }            </mx:Script>     <mx:TabNavigator width="200" height="100" id="myTabNav" change="handleChange()">         <mx:Canvas label="Tab 1" />         <mx:VBox label="Tab 2" />         <mx:HBox label="Tab 3" />     </mx:TabNavigator> </mx:Application>